Thread: Effects of Synthetic Fluids on my S/C GTP

Originally Posted by Jess3103

IMO I used royal purple in my 05 GTP. I had ALOT more done to that car and LOVED the royal purple. When I got the 07 I changed all fluid and added Royal purple. I went to have my oil changed before a road trip and it was about 500miles away from being 3,000 and the Tech guy asked when is the last time I changed my oil!! He said it looked as if I hadn't changed my oil in a good 6K miles! So im not sure if I got some bad oil or what. But I went back to Mobile 1 Syn. I know he was not bs'in me because he is my uncle! LOL.

The key word in that sentence is "looked". Royal Purple isn't a conventional oil and you can't treat it like one. You can't look at the oil to see if it needs changed. The best way to know if a synthetic oil needs changed is to have it analyzed. Or just change it at regular intervals. But synthetic oils can go much longer oil change intervals than 3000 miles. So first, there was no reason your oil needed changed when you changed it. Second, you can't just look at a synthetic oil to see if it needs changed.

Originally Posted by Zef_66

Second, you can't just look at a synthetic oil to see if it needs changed.

You can't do that with any motor oil.