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I switched my 1st 740ti SE over right after buying it to Castrol Syntec (75K mi) in 1997. Around 85K mi I switched to Mobile One Synthetic and used that until it was totaled in 2000 (114K mi). It started to develop leaks 'everywhere' around 110K mi.
Switched my Blazer over when I bought it in 2001 (34K). It's had Mobile One synthetic & filter every 5000mi to 7500mi, no leaks or issues as of yet. Just hit 134K mi last week. I'm VERY surprised it hasn't leaked, especially being an American vehicle. I guess I switched early enough for it not to be an issue.
I still haven't decided if I'm going to do it with the 744ti SE I have now. I'm not sure when I'll get around to 'building the engine' I want, it could be in a few months or it could be in 4 years. When I do it, it'll get nothing but Mobile One Synthetic. Until then, I'll probably stick with the regular stuff for now. No need for leaks, and with gas prices the way they are I won't be racing for a while.
Rule of thumb I've heard is never switch after 50K miles (low) / 75K miles (high), if at all possible. At 251K miles, you're just asking for leaks galore if you switch over.
As far as the filter...if you switch to Mobile One synthetic oil, then buy the Mobile One synthetic filter. Anything is better than Fram though, but for synthetic you should use a filter designed for it.
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MD ( 91 744ti SE w/M46 - 99K | 98 Chevy Blazer LT - 134K )
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