Hi,
I used to use Mobil Clean 5000 10w 30 (regular oil).
I switched both vehicles 1990 244 (has 249,000 miles) and 1992 245 (has 199,000 miles) to
Mobil 1 High Mileage 10w 30 (synthetic oil) several months ago. The reason I switched over is both my wife and I work close to home and I also wanted to extend the oil change intervals.
The Mobil 1 High Mileage Synthetic is supposed to condition seals on older (higher mileage) vehicles so there is a low possibility of any leakage from the switched over-at least that's what I read on the Mobil 1 website. Either way the Mobil 1 High Mileage was the same price as the regular Mobil 1 so I figured it couldn't hurt.
It's also a good idea if your car is switched over to synthetic, to change the oil filter around 1,000 miles after the first fill up of synthetic.
And as another suggestion-use a Mann oil filter (as most will agree on here, it is the best/most reliable oil filter to use.) You can order a case of 10 filters for around $40 at FCP Groton, eEuroparts, etc.
Travis
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