I have a 2003 g 35 with 60,000 miles. I have used conventional up until now. Can I use synthetic with harming the engine?
thanks

Yes, you can move to synthetic.

You can do it at any time or else the commonly sold 'blends' of both would be impossible to sell wouldn't they? They should make it a law to have to disclose what % of true synthetic is in those blends.

OP, some few people complain that with switching oil type seals can sometimes leak after a time, the syn softens them up a little bit. Not likely now but you should know.

wilbanks51 wrote: ↑

Wed Jan 24, 2018 10:37 am

I have a 2003 g 35 with 60,000 miles. I have used conventional up until now. Can I use synthetic with harming the engine?
thanks

Why would you want to do that?
On a fifteen year old vehicle why would you want to spend more money on oil on a vehicle that does not require synthetic oil?

You are asking for trouble.

Telcoman

Telcoman,
What about switching brand of conventional oil...say moving from Pennzoil to Mobile. Does it make any difference?
thanks

wilbanks51 wrote: ↑

Fri Jan 26, 2018 8:04 am

Telcoman,
What about switching brand of conventional oil...say moving from Pennzoil to Mobile. Does it make any difference?
thanks

No!

https://en.wikipedia.org/wiki/Motor_oil

Telcoman

I have a 2014 Q60S (which I'm sure you know is just a rebadged G37), a 2004 350Z and a 1990 5.0L Mustang.
I run Mobil 1 in all three and also ran it in a 2001 Honda Accord which I gave to my son. That Honda has 170K on it and still runs like new. The Z has had Mobil 1 oil changes and now has 125K on it and runs like new.
The Q60S only has 9K miles on it and I am hoping that by using a full synthetic it too will last a long time.
A full synthetic reduces wear as compared to regular oil. It also resists sludge and varnish issues far better then
conventional oils. But, both types will still suspend byproducts of combustion and need to be changed on a regular
basis. This BS of leaving oil in a VQ engine for 10K or 15K just because it is synthetic will net you a badly
sludged up engine and a ton of that brown varnish crap all over everything which will reduce engine life.
I have had many engines apart and I can tell you that full synthetic oils are better. Also, it is never too late to start using them and they will NOT damage seals or anything else. Those are old BS tales that were born on the internet by people who do not know jack about engines. Nothing beats a good quality synthetic oil. They maintain viscosity under adverse conditions far better then conventional motor oils. I even use Mobil 1 in my Hustler Mini Z mower's Kawasaki engine. Also use it in the Briggs engine in my generator. The stuff just plain works. As my dad used to say, good oil is cheap insurance.. Real cheap insurance considering what engine repairs cost these days.