If your not using synthetic you should.. it is much cleaner and just a better longer lasting lubricant. If you are running regular now and switch to synthetic you run the risk of having to replace all of your engine gaskets. This is because regular oil leaves deposits in your gaskets that over time actually help to hold them together, when you switch to the cleaner synthetics it will in a sense wash away these deposits left behind by the regular oil and cause your gaskets to fail.
Catalyst is right I have a friend who switched over in his 88 audi and the thing leaks like a son of a bitch now. However I switched a couple of months ago in my 99 with 62,000 miles on it and everything is just peachy as of this point!
If you do go for synthetic you should run mobil 1 awesome oil!
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Umnitza now provides a mechanic to install all parts ordered right in the box! It's their new "Total customer service program" that will eliminate all the haters and keep incompetents from breaking shit and blaming the vendor! When you are all set simply call INS and they will pick him up free of charge.
I switched to synthetic and have noticed leaks. I knew these were bound to emerge, but I don't care. I'd rather have a few leaks than having all kinds of gunk swimmin around inside my engine. I use Mobil 1 as well.
dont bother taking out the pan... you will have to drop the steering rack and its just a mess... i had 109k on mine when i switched, and i didnt have a leak on the first change... but on the second my car began to leak. I replaced the Valve Cover Gasket (Very easy - about $50) and it doesn't leak anymore. I ues Mobil1 15w-50, and it works great.
Synthetic Oils use smaller chain hydrocarbons (smaller molecules that slide against each other better) which will fit into smaller cracks easier than conventional oils. This is where the oil leaks come from. As well, if your motor is burning oil, it will burn more oil with synthetics (smaller chain hydros again)...
I have synthetics in my Engine, 5 speed, and Diff. They are especially useful up here in Canada where, as you can see in the Weather Box below, it's colder than in the US. The drive train experiences better oil flow at all temperatures, which is a better thing at all times!
I have to laugh about the GUNK in the conventional oils sealing better! So, dirty oil is better for your car, go figure!
I ahev synthetic trans and diff fluid and good ol reg oil in the engine. I have always heard that if you have less than 30k miles switching to synthetic is fine and better for the car. If you have more than 50k don't switch jsut stay with what you have and if you are in between then it is a judgement call.
I run Redline Racing Oil (10W40) have over 100K on the clock, and have no leaks. What I do have, is better gas mileage, smoother idle, and believe it or not noticeably smoother acceleration. And yes, I'm sure a bit of this is placebo affect, but it's a better product, so use it. I don't have to buy premium gas, but I love my car, so I do. Yeah it's $70 everytime I change the oil, but that is only whenever I feel like it. Redline rates their product to be good for about 17K miles. I plan on changing it at about 7500.
I changed to synthetic because I know it is better and because I was very uncertain as to what would constitute good mineral oil. I have noticed leaks, and am thinking (from reading this thread) that I will soon change my gaskets. Which gaskets are we talking about here? I can think of the valve cover gasket and the oil pan gasket. What else should I look into? I will probably do the oil pan gasket next time I change my oil, but I would like to know what else I may be facing so I can just order all the parts at once, or brace on if there is something that needs to be done by a shop.
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