I change every 5K with Liquimoli 5w-40... I'd use 5w-40 over 5w-30, especially if you're doing any kind of upgrade to performance. Car will run a heck of a lot better.. 5w-30 is to thin when working an engine as hard as most of us do.
For those of you having a hard time finding VW spec. oils and you desperately want to stick to the 5w-40, try your local lawn mower, or small engine repair shop. In my area only they stock the 5w-40 synth. VW 502.00 oil - they used to get Elf/Total, but recently moved to Amsoil.
All I know is my dealer used 5W30 Castrol throughout my free factory serviceand I burned oil like crazy, since I have switched to Motul VW specific 5W-40 I have yet to burn anything noticeable.
The extra fuel is indeed from my mainly DD of the R, but using Rotella is just fine.
Rotella T6 5w40 in my R is running great
Just did the oil change last week... the 5w-40 didn't seem to like the unusually cold temps we had here over the winter... now that it's warming up outside the Rotella seems to keep a lot of the mechanical clatter of the engine down and it runs like butter.
My car runs full synthetic, no additives. I find a 2.0 engine oil filter mount swap(from cartridge to screw on), royal purple filter, and penzoil ultra/platinum are an amazing combination.
After break in, I started using Rotella 5w40 synthetic, as I got better mileage with it. It's looking like a 5w may be way too thin for these old motors, and perhaps I should have stuck with a 15w40!
I've been running 12k-20k, oil & filter change intervals with Amsoil since 1978 (mainly in VW/Audi engines) and have never come close to wearing out an engine. When I sold my 1990 Audi 100 with 260k miles, it was still only using a quart of oil in 10,000 miles.
For my 2.5 engine, with +100k miles and a turbo, ive been using liqui moly with great success. It meets the 502 requirements, and it yields great results.
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