OIL CHANGE/TIMING BELT

CARLOS · Post by **CARLOS** » 06 Nov 2002, 12:03

LAST TIME I HAD THE DEALER DO THE 60K TUNE UP ON MY S70 AND WHEN THEY CHANGED THE OIL, THEY USED SYNTHETIC. FOR REGULAR OIL THE INTERVAL BETWEEN OIL CHANGES IS 3.000 MILES, SO WHAT SHOULD I DO ON SYNTHETIC OIL. ALSO AT WHAT MILEAGE SHOULD I CHANGE THE TIMING BELT (ACTUAL MILEAGE=61500). THANKS IN ADVANCE.

Post by **matthew1** » 06 Nov 2002, 17:39

The first time you switch to synth., you should stay with 3000 or less because the new oil may loosen up deposits. Then on second and thereafter go to 5k or 7.5k miles. I do about 4 or 5k between synth changes.

Timing belt: don't know. Mine is 70k miles, and I have an 850, so yours *should* be the same or more. Call the dealer for 100% certainty.

TAFinley · Post by **TAFinley** » 20 Jul 2004, 07:58

If you have positive crankcase pressure, you probably also have leaking seals. One mistake folks make is to replace the seals without correcting the underlying problem of positive crankcase pressure.

Fortunately, there is a very simple test you can do yourself to determine if you have positive crankcase pressure. With the engine running loosen the oil filler cap completely. Don't remove it, just loosen it to the point that you could lift it straight up if you wanted to remove it.

When the oil filler cap is fully loosened, it should sit in place on the valve cover and there should be a slight resistance if you try to lift it. If the cap "wiggles" or "dances" when it's fully loosened, then you have positive crankcase pressure and it's time to start checking the crankcase ventilation system.

By the way, the leakage from the seals will often stop on its own once the crankcase pressure problem is fixed; however, if oil has already leaked onto the timing belt, the belt should be replaced.