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my car has 108,000 miles...and I am thinking of going with full synthetic so I can just change it once or twice a year...<p>Anyone else switch over?
 

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Re: Should I convert to full synthetic? (nobbe3728)

I've heard of problems if you do it at too high of a mileage... something about the synthetic cleans out all of the residues from the dino oil which are actually plugging up holes in your seals, which then leads to oil leaks. Some folks get away with no problems, others have reported they had to replace the old seals with fresh ones. Unfortunately there's probably no way to tell beforehand...
 

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Re: Should I convert to full synthetic? (kageryu)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>kageryu</b> »</i></TD></TR><TR><TD CLASS="quote">I've heard of problems if you do it at too high of a mileage... something about the synthetic cleans out all of the residues from the dino oil which are actually plugging up holes in your seals, which then leads to oil leaks. Some folks get away with no problems, others have reported they had to replace the old seals with fresh ones. Unfortunately there's probably no way to tell beforehand...</TD></TR></TABLE><br>I agree.<br>At this mileage I would just stick with a quality dino oil and change every 3 to 4K miles
 

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Re: Should I convert to full synthetic? (nobbe3728)

I bought my 850 used with 130,000 miles on it and went straight to Quaker State Advanced Synthetic.<br>Been using it now for a while no issues.<br>If your car was a sludge-o-matic prior i would not switch but if it was maintained you should have no problem.<p>P.S. You still have to change the Synthetic at normal intervals.
 

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Re: Should I convert to full synthetic? (854T5)

it's been very well maintained...but I think I'm gonna stick with the dino oil
 

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Re: Should I convert to full synthetic? (nobbe3728)

<IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0">
 

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Re: Should I convert to full synthetic? (nobbe3728)

Kageryu has it mostly correct. But you can convert over if done with care. <p>By a certain mileage, conventional oil deposits reach the edges of seals and build up an effective but ultimately false seal. The seals need to be fully cleaned of all deposits before a changeover to synthetic. Synthetic oils have better detergency than conventionals, but are not designed for deep cleaning extensive deposits. Consequently, a synthetic will often clean the seals just enough to develop a leak.<p>I have converted several high mileage engines to full synthetic with no problems whatsoever. I suggest two treatments of AutoRX, a very effective and very well regarded crankcase cleanser, before converting. Besides fully cleaning the seals and the rest of the crankcase of all deposits, it will clean out the valve train and ringpacks. Afterwards, you can convert to a full synthetic with much higher confidence.<p>Of course, if you have gasketing leaks, a synthetic will only increase the rate of leakage and these should be repaired.
 
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