reno808

I use castrol GTX 20-50

xsboost90

Ditto- been using castrol for years w/ no problems- i ran castrol syntec in my supra turbo and it used to burn that stuff up way too fast.

AL951

I use Mobil 1 20w/50 for years in my 924, 944, 951 and BMW 530I. No problems to report. and it keeps the inside of the engines clean.


Also to break in the engine, I go to my favorite empty road, and I do 13-15 full load runs at low boost 2-3 psi. From 20 mph to about 55 mph in second gear. After every run, I let the engine vacuum slow the car down to 20 and then I do it again, antil I reach the target nember ot times.


regards,
AL

dime1622

I third the GTX 20/50. Can make it a bear when it gets really cold, but I just drive the Blazer instead.

Darwantae951

Ive been using Valvoline Semi-Synthetic, and It's done a great job.

-Darwin

GeorgeNZ

thanks Bret, Jeff, Mike - I know better than to ask what oil to use

MPD47

Forgot to mention, the letting it "wind down" with engine load is very important, helps ensure proper ring sealing via engine vacuum

UK952

I use 15/50 synthetic - its not thin, I have run it for 90K plus miles i have put on my car, 5k ago my HG went my bores were unmarked total miles 176k at that point.

I was occasionally hitting over 30PSI (lively) due to a boost controller leak which took out the HG. I do trackdays on slicks and often hit the rev limiter on the road, My car is around 350BHP.

My hot oil pressure only drops just below 3.5 bar on hot summer trackdays at idle.

I used to use mobil 1 motorsport now mostly use Silkolene Pro R.

I used to be into Modified Minis in a big way (1380 with rally cams big carbs etc.), they have a very hard life as the gearbox and engine share oil, Mobil 1 was a vast improvement over any other oil I used. (on the big ends, drop gear bearings etc.)

The only 'problem' with good synthetics (quality varies) is that they contain high quality detergents - on a sludged up (cheap) dyno oil run engine this may clean crap from behind the seals and create leaks.

Tony

Tony

500

That is a good tip that I was not aware of previously. Thanks!