It's time to change the oil in my car and I had a question since my dad said something that sounds ridiculous to me.

Can you switch straight from regular to synthetic? I wanted to stop using the Castrol GTX regular and go to Mobil 1. Can you do it all at once, gradually, or not at all? Thanks

You can do it all at once. Its better to do it while you have low mileage though. Highmileage cars dont really like synthetic.

How can I tell if I have regular or synthetic. ive only gotten the car's oil changed once, and that was at a firestone, so I dont know what they used. Is 66k miles to high to put synthetic in?


1999 Mitsubishi Eclipse GS 10th Anniversary OZ Edition
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If you paid less than like $30 for the oil change, then they probably used regular conventional oil. Most places add like $20-$25 for synthetic.

And most places will definately tell you if they used synthetic oil. If they didn't say anything about it, they didn't use it. The only downside to switching to synthetic on high mileage cars, is because synthetic oil will penetrate into EVERYTHING, (which is good) but you will get seeping valve cover gaskets. My buddy has a 92 MR2 NA, and switched to synthetic at 135,000 miles, with no drawbacks. No leaks either.

hehe, your rs looks just like mine