I have read through a multitude of posts on synthetic oil use on this and other sites. It seems difficult to refute that ultimately synthetic will be better for your car. However, there may be issues with seals starting to leak on older cars. I want to put my '97 328i with 106km on to synthetic and I'm throwing out a couple of thoughts. Please tell me if I'm an idiot...
I keep reading about people using the autoRx to clean their engine and "recondition" the seals. Then they go to synthetic. Why not just switch over to synthetic and let it clean your engine and then add a product to stop your leaky seals if required. Wouldn't this clean your engine and then "recondition" your seals. Follow up with a short first filter and/or oil change interval to remove the crap from your engine. Maybe?
Also what about the idea of moving to a synthetic blend first and then going to a full or "full" synthetic oil. Would there be any benefit to this gradual approach?
if your going to move to synthetic than just do it, with only 106k on the car its not that much, my car went full synthetic at 136k and i had not one problem, and i used lubro molly like trig said, but only because my mechanic only uses that. there are a few other brands that i suggest if lubro is hard to get ahold of. sr2000 and mobil1 are a bit more accessable.
again i dont think you will need to do any sort autorx type additive for quite a while as long as the motor was well taken care of.
I switched to Mobil1 at 169,000 and haven't seen any negative consequences. I am now at 202,500 miles. After the first synth oil change, I think I only went like 1,500 miles. Then the next I did 3,000 after that. I have been changing my oild every 6,000 miles ever since. I read somewehre that it was good to shorten the interval at the beginning in order to remove any debris that the synthetic may pry lose inside the engine.
I do know that BMW motors last a hell of alot longer on full synthetic than on crappy ass dino oil, and once I get mine fully broken in (after the first 10k) I'm going to be switching to Voll Synthese from the BMW oil.
Addicted to Speed Since 1997 Founding member of the GreenDragon Poo Flingers Club
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After some searching through my engine and oil, I think that I have come to some conclusions about my car....
When I changed the oil it was already synthetic. It was also full of crap and likely the first oil change since it went to synthetic. I think that some of the gaskets may have developed minor leaks which encouraged the previous owner to sell. I filled it up with Mobil1 synthetic 10W30 for high mileage cars in order to get the gasket and seal conditioner. At this point everything seems to be working beautifully and leak free.
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