motor oil for a diesel engine might be expensive but a diesel engine is far more expensive so let's get the testing underway and see which brand is the best we'll see at the $14 mobile delvac flows just as well as a $58 AMS oil when the oil is extremely cold we'll see which oil offers the best protection against engine wear we'll compare the oils to see which is best at resisting thermal breakdown and evaporation I paid an independent oil ADB to provide us with a detailed report for all six motor oils before we jump into the testing let's send off the oil samples to an oil Testing Lab I always shake the oil containers just in case some of the additive package has fallen out of suspension and settled at the bottom of the container to avoid a mixup I'm labeling each of the sample bottles we'll go over the results later in the video the high temperature viscosity is the number after the dash and it indicates the oils flow characteristics in a warmed up engine we won't test the oils at full operating temperature but let's see how they perform at around 70° F mobile D vacaz in Lane 1 Rotella T6 Lane 2 Royal Purple Lane three and schafers a lane four and the Royal purple's out of the gate first but it's an extremely tight race with mobile delac and a very close second and the race is already over with royal purple finishing in 2.98 seconds mobile delvac finish in a close second at 3.03 Rotella T6 finished in 3.08 and schafers in 3.13 seconds faster is not necessarily better but it will provide us with a lot of great information that we'll go over later in the video and it's Hot Shots competing against DS oil and both oils hit the track at very close to the same time but the Hot Shots is on the Move unfortunately am oil doesn't have a chance and his hot shots for the win with the fastest time of the six or brands at 2.4 4 6 seconds so the Hot Shots is the thinnest oil and it's also the fastest flowing at 70° F at 2.46 seconds Royal Purple finished in second plays at 2.98 seconds and mobile delvac 3.03 let's refill the oil tester with each of the oils and then place them in a freezer that's set the -40° C which also works out to be -40° F we'll see how the oils flow at an extremely cold temperature later in the video at a price of only $14 the least expensive oil we'll be testing is made by mobile delvac all the motor oils will be SAE 15 W4 viscosity this oil is API ck4 it's supposed to offer engine protection we're going to test that extended drain capability it's supposed to keep the engine clean high temperature protection made in USA at a price of $23 is this Shell Rotella T6 it claims to be a full synthetic it's even designed for use in motorcycles shell gives their oil four check marks for fighting wear deposits and oil breakdown four check marks for synthetic technology four check marks for extreme temperature protection we're going to test that API service ck4 the Rotella T6 is made in USA let's first compare the mobile delac against the Rotella T6 to avoid making a mess I'll first pour the oil into a cup I'll then transfer the oil into the test pot each of the pots weighs a different amount so I'll measure out precisely 200 g of oil I'll then crank up the heat to around 400° f for 2 hours I'll rotate the oil containers every 10 minutes just in case one burner is just a little bit hotter than the other and both oils look to be about the same color at the start of the test and it's been about 31 minutes and the Rotella T6 is still looking good but the mobile delac is already becoming dark and both oils seem to be performing well but there seems to be more Vapors coming out of the Mobile delac Oil container and the test for this is a Noak volatility test which is ANM test this test exposes oil to a lot more heat than this test to simulate engine operating conditions around the upper piston ring area of an engine high quality engine oils resist evaporation and thermal breakdown at the end of this test we'll find out how much evaporation has occurred with each brand then we'll be using the cooked oil for additional testing to see which oil is the best it's been right at 2 hours once the oil has cooled off we'll wait each container to see how much evaporative loss has occurred and the Mobile delvac Oil container started out at 394.455 G of oil evaporated and the Rotella T6 started off at 44.6 G and it now weighs 397.93 that's a loss of 6.64 G so it's a very close win for the rala T6 Let's test the lucity or film strength of the mobile delvac against the Rotella T6 next we'll Begin by adding 40 mL of oil that's and exposed to heat into the test cups I'll pre-coat the test wheel and the test pin and motor oil to avoid damage from a dry start the lubricity test will provide us with some great information on how the Oil performs for anti-wear properties and the mobile delac is starting off around 480 WTS and dropping quickly while this test doesn't simulate engine operating conditions perfectly it'll definitely provide us with some great information after the test we'll compare the size of the wear scars on each of the bearings to determine which oil provides the best film strength between each test I'll use brake parts cleaner to clean the test equipment and then I'll use sandpaper to to resurface the test wheel and it seems to be really close but the Rotella T6 seems to be starting off with a little bit less friction than the mobile delvac just like with the mobile delac the test pin is receiving very good oil flow on the tester and the test is over so let's compare the mobile and the Rotella test pins under a microscope I always label the test pins right after the test to avoid a mixup and a mobile delvac has a wear scar of 5.94 mm which is actually pretty good mobile delvac is on the left and Rotella is on the right and Rotella T6 performed even better with a wear scar of only 5.63 m M at a price of $30 is this Royal Purple durac they claim it has synthetic technology it's also API service ck4 it's supposed to maximize engine life improve fuel economy and is supposed to be approved by all major manufacturers the Royal Purple is made in USA at a price of $42 is this Schaefer brand it claims to be a synthetic plus diesel engine oil formulated to meet API ck4 excellent wear protection oil durability with strong oxidation and viscosity control it claims that their oil is friction modified with mic CR mly and penetro the shafers is made in USA I've added right at 200 g of oil into each of the test containers let's kick off the 2-hour evaporative lost test with the Royal Purple going up against the schafers and the Royal Purple is starting off really dark and so is the schafers just as I did with the mobile and the Rotella the 2-hour test is up and the oil is cooled off and the Royal Purple started off at 399.24 G and it now weighs 394 that's only a loss of 5.25 G the best yet and the schaer started off at 45.72 G and it now weighs 399.4 n so 6.23 G of oil evaporated for the schafers to move into second place overall behind the Royal Purple let's see if the Royal Purple provides better protection to againsts wear than the mobile delac and the Rotella and the Royal Purple seems to be off to the best start yet but it's very close and the test is over and the Royal Purple barely outperformed a Rotella T6 at 5.6 mm compared to 5.63 for the Rotella and the shaer seems to be off to an even better start than the Royal Purple the schaer seems to have a little bit higher viscosity compared to some of the other brands and that should help and the schafers performed by far the best yet with the wear scar of only 5.27 mm the Royal Purple is on the left and the schafers is on the right and both oils did a really good job but a shafers for the win at a price of $55 per gallon is this Hot Shots Blue Diamond it claims to have fr3 nanot technology unlike the previous Brands it claims to be a full Pao synthetic they claim that their pa oil is superior to group 3 synthetics a full Pao oil contains group four Pao synthetic base stock exceeding requirements for multi great engine oils provides a much easier flow in cold weather startups that dramatically reduces wear the Hot Shot Secrets is made in USA at a price of $58 is this AMS oil diesel oil Signature Series it claims to offer six times more wear protection it claims to be 100% synthetic you can use this oil and engines designed for API ck4 maintains proper viscosity minimizes oil consumption excels in extreme temperatures control suit thickening and the M Oil is made in USA and it's the two most expensive oils competing against each other and both oils seem to be performing well but the Hot Shots is becoming darker sooner than the AMS oil while it is highly subjective the Hot Shots seems to be producing more Vapor than the AMS oil and the 2hour test is over and both oils have cooled down and the hot shot started off at 410.50 G and it now weighs 4 5.33 that's good enough to move into second place behind the Royal Purple at 5.52 G of evaporation the AMS oil started off at 48.91 G and it now weighs 41477 that's only 4.14 G the just yet very impressive and there's 40 mL of hot shots in the test cup and it's ready to be tested against the AMS oil and the hot shot seems to be performing about the same as the Royal Purple at the start of the test unlike the previous Brands this is a group four Pao oil which claims to be superior than the previous four Brands which are group three synthetic oils and the test is over and the Hot Shots has a wear scar of 5.51 mm to move into second place behind the schafers and the AMS oil seems to be performing the best yet at the start of the test with energy use dropping quickly and the AMS oil seems to have a very high viscosity and that seems to be helping and the test is over and the amso has a wear scar of 5.22 mm the best yet very impressive Hot Shots is on the left and the amzo is on the right with a smaller wear scar so the amzo has the smallest wear scar at 5.22 MM but the schaer is finishing a close second at 5.27 Hot Shots finish in third at 5.51 MM diesel engines especially those with a turbo can experience a lot of Heat and the amsor will experience the least amount of evaporation at 4.14 G Royal Purple 5.25 G and Hot Shots 5.52 and the uncooked oil has been in the freezer for 24 hours so let's see which oil flows the best when it's extremely cold during a cold start a lot of engine work can take place and the Rotella is out of the gate first and flowing quickly and Royal Purple is trailing Rotella by quite a wayte and shaer in third and the Moville delac really needs to get a move on it and it's Rotella for the win and Royal Purple finished in second place and schaer in third and it's Hot Shots versus AMS oil and the Hot Shots is out of the gate very quickly and the AMS oil is not liking the cold temperature and the hot shots isn't looking back or slowing down and it's hot shots for a huge win over the AMS oil if you're looking for an oil that flows easily in extreme temperature the Hot Shots came at on top at 95.4 seconds Rotella T6 finished in a very distant second place at 134.2khz Royal Purple finishing in second Rotella third and schaer fourth and it's Hot Shots going up against the Amsoil and the Hot Shots is hot right out of the start and is way out ahead of the Amsoil and it's hot shots for a very easy win over the amoil so the mobile didn't experience any change in flow speed but all the other brands did slow down let's compare the performance of new versus cooked motor oil let's place the cooked oils in the freezer once again for 24 hours and we'll see if the heat exposure had an impact and 24 hours is up and the Order of competition is the same with Mobile in Lane one Rella roow purple and schafers and once once again the Rotella is performing very well in the extreme cold schafers held up really well after exposure to heat and it's in second place this time in the last race Royal Purple was in second place but it's lost a step and it's trailing in third and the Moville delac just do not like the cold and is trying to catch up and once again it's Rotella for the win and his chafers finishing in second place Royal Purple third and mobile fourth and His Hot Shots going up against the anoil once again and Hot Shots continues to perform extremely well when it's extremely cold and the am oil is still struggling once again and it's hot shots for the win and the ham oils about halfway down the track so after the exposure to heat the Hot Shots is still the fastest oil at almost 108 seconds Rotella finished in a distant second place at 142. seconds and schafers oils look very welld designed in this category however the schafers has the highest level at 2,141 parts per million Royal Purple wasn't too far behind at 2,129 Parts in AMS oil 248 anti-wear additives are incredibly important for engine life and performance and the amsor has the best anti-wear additive package at 2,129 parts per million schafers also has a very robust anti-wear additive formula at 242 parts per million in my opinion the mobile delac is a little bit low on anti-wear additives at only 1,451 parts per million I'd expect to see this type of additive package for an oil designed for a gasoline engine so which motor oil is best I really think this depends on what you're looking for the mobile delac is very affordable but the price tag seems to make sense when you look at the anti-wear additive package 1,451 parts per million just doesn't seem like enough the Rotella T6 isn't the best at anything but it's actually pretty good at just about everything considering the price tag it's a great value in my opinion a little bit higher anti-wear additive content would make this o even better the Royal Purple also seems like a pretty good oil I found it very interesting that the oil did a great job at resisting evaporation however the heat really hurt how the oil performed at cold temperatures it also seems pretty low for anti-wear additive content if you're looking for an engine oil that allow for a very long engine life schaer seems like a great choice with a very robust additive package and it performed very well in my testing if you need an oil that flows very well in cold temperatures the Hot Shots ran circles around the competition for cold oil flow in my opinion the anti-wear additive package seems a little bit like but it did perform well on the lubricity test just like the Shavers the AMS oil seems very welld designed if you're looking for an oil that allow the engine to last just about forever it does have a great anti-wear additive package however it is very expensive at $58 per gallon I really had a lot of fun testing the diesel motor oils and all the videos in this channel are viewers suggested so if you have a video idea I hope you'll take time to leave a comment thanks so much for watching please take care and I look forward to next time