I use Rotella in old VW Bug. Seems to work well but i put very few miles on the car.
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I always use full synthetic Mobil 1 5W-30
I run Rotella in my 49 flathead and in my 91 civic.
The Rotella T4 isn‘t officially sold here in Europe. I use Liqui Moly touring high tech. It still got high ZDDP (>1200ppm). And it‘s also quite cheap.
As long as you don't have a catalytic converter on it Diesel oil with Zinc is the best
I run Rotella in my E24 at the advice of people on the BMW forums.
So I took his advice and did the Rotella T-4 and MMO in my 71 LeSabre 350. Added a little to the gas, too. I run 93 octane gas. Engine is stock and original, about 90k miles. It's running so smooth now. It was an immediate, noticeable difference.
Amsoil. I run it in anything and everything they make fluids for. Even the 2 strokes. Father has been a dealer for decades and the number of stories he has backing up amsoi's marketing claims is IMPRESSIVE. I've personally seen a few success stories already and PLENTY of scientific testing
Valvoline 20w-50 works great
I personally used to run mobil 1 0w-40. as you said its super thin and seemed to just barely get the job done. Recently switched to castrol SLX 5w-30 and I am decently pleased with the first two changes.
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