Red Line 15304 SAE 5W30 Fully Synthetic Motor Oil - 1 Quart (12 Pack)

This oil is is the good stuff for my 2001 Mustang GT's 4.6L engine. The reasons why are complicated. I'll try to explain without writing a novel.The 4.6L Ford engine first appeared in the 1991 Lincoln Town Car, and Ford specified 10W30 oil for it. Ford changed the spec to 5W30 when it became available. This engine was designed when ZDDP was the primary antiwear additive, and there have been no changes in the engine's metallurgy, clearances, etc. In response to pressure from the EPA to improve their CAFE (Corporate Average Fleet Economy) Ford went to a 5W20 that they blended as a heavy 5W20. This was for fuel economy reasons only, and you would need laboratory conditions to detect the 0.6% improvement in fuel economy. Ford made this change in 2001 and recommended 5W20 for all earlier models of the 4.6 engine. However, this change is in the USA only. In foreign markets where there is no government pressure for fuel economy Ford continued to specify 5W30.Meanwhile, pressure was put on the oil industry to reduce the amount of ZDDP in motor oil in order to prevent catalytic converters from getting coated with phosphorus. The industry has moved away from ZDDP (the amount is typically cut in half in most oils) and offset that with increases in molybdenum which has both anti-wear and friction-reducing properties. But there is no formal testing to determine if the substitution actually works.Finding a modern 5W30 oil is no problem, but 99% of the brands do not have anywhere near the level of ZDDP that was expected by the engineers at Ford who designed the 4.6L V8 engine. Red Line 5W30 is the exception because it has high levels of ZDDP. This is important because the oil is subjected to thermal and shearing stresses. Red Line 5W30 has a HTHS (High Temperature High Shear) value of 3.7 (higher is better because it indicates less engine wear), which is as high as I've seen in a 30 weight oil. To put that in perspective, the Motorcraft 5W20 semi-synthetic oil that Ford specified for my engine has a HTHS value of 2.6.I keep my cars far longer than the average owner, and I learned long ago that high quality fluids are cheap in the long run. Every oil change my engine gets 6 quarts of Red Line 5W30. Not 5 quarts as specified in the owner's manual. The reason is another long story. I'll explain in the comments if anyone asks.

I've been using Redline synthetic oil for more than 35 years. I first noticed a box of it sitting in a BMW dealer's Service Manager's office. I researched it and have been using it ever since. I was able to put 185K aggressively driven miles on my 1985 BMW 535i and never had to do anything more than tune-ups and regular maintenance. The engine in the 535 was known to wear in the area of the camshaft rocker arms which would ultimately become quite noisy at idle. This never occurred with my car which I attribute to Redline oil's outstanding lubrication on engine startup. I sold the car to my brother and he continued driving it and using Redline oil for close to 300K miles. After that experience and more similar that followed I have become a believer in Redline products. There are a number of quality oil products out there but if you wish to trust your pride and joy to one of the finest (same base base stock used in modern jet engines) you will not be disappointed.

I love Red Line lubricants, and have used them for years, off-and-on. My only problem is that it can be hard to find, and top-ups aren’t typically a local auto-parts store item.In this case, I thought I’d try it in my ‘02 4Runner with over 370,000 miles on the clock. I’d been using Mobil 1 high-mileage oil and had been mostly pleased with it, but thought I’d try my old favorite.Well... still love it, but I’m going back to the high-mileage Mobil 1 on _this_ vehicle. For whatever reason, I run through the Red Line rather too quickly compared to the Mobil HM oil. It doesn’t seem to burn any oil... amazing, right?... but it’s going somewhere, possibly a leaky valve-cover gasket (a common problem on these V6s).But... no experiment is a failure, so no dings against the Red Line.

The best oil on the planet, bar none! I had a 1995 Mercedes while living in Europe, that developed a stuck lifter rattle. After about a year of putting up with this annoyance, I changed the oil using Red Line and the rattle was gone in under 10 seconds and never came back. The Red Line I used in this car were my last quarts (trying to save them for my Corvettes) that I could no longer get while in Europe so I had to go back to Mobile 1. The motor still never rattled again. I use Red Line in all my cars. The slightly greater expense is well worth it!

Decided on Redline after much research on the best "ester based" synthetic oil. This is my 5th oil change to date with Redline 5W30 going about 5200 miles between. In the past using dino oil and other synthetics I would notice a huge difference in smoothness both at running speed and idle immediately after a fresh oil change only to wane midway through oil change cycle. Not with this oil, engine is just as smooth even at the back end of 5200 miles. Probably could go a couple of thousand more on this oil. It would be interesting to send in a used sample for testing just to see how much accumulated particles from wear are there. I trust this oil to wait a bit longer for my next oil change if need be, the protection is there.

Yes it is expensive but so is a motor. If you really care about your car or truck or feel you could use a little extra protection, this is for you. Some people think it's crazy to spend more than a few dollars for a quart of oil. And all oil is the same.... This is not for them!

I own a 2012 BMW 335is. This car is notorious for having a "rough idle" upon cold start. However, I noticed that the car runs smoother upon a cold start after the oil change. In addition, there is about a 20 degree F reduction in normal operating temperature compared to the dealer supplied BMW oill (Castrol). This oil is approved for LL-01 which meets/exceeds BMW OEM specifications. I also own an Acura RSX which has been running Redline 5w-20 since it's first oil change and it's pushing strong with over 105k miles with zero issues. Going forward, Redline will be my go-to oil for all my vehicles.