I'm the original owner of 03 G35 Coupe, 6MT. My car has been burning oil for a while. I think I go through a quart in 1,000 miles. I have over 200K miles since I bought the car brand new. I'm wondering if 5w30 would give me better protection at start up than 10w30. I've been using Mobile 1. Any suggestions?

 

I use 5w30 on my 05 6mt coupe

 

If you're burning oil and you have that many miles you want to move to 20w50, my friend. I'm gonna have a lot of people chastising me for this, but believe me or not, 20w50 conventional oil would be your best bet.

 

Whaaa?
Thats a great way to put even more stress on an already aged engine.. A viscosity that high is gonna increase pressure and reduce lubrication. Yeah for an 80s or earlier car that may be fine, but definitely not modern day engines.

You can get away with a 40 weight oil (many people actually run 40 weight already) but any higher you risk even more problems than OC..

 

I ran 20w50 conventional in the G for 3 years. Guess what happened..

Oil viscosity should be chosen based on the climate in which you drive.

 

No **** this is exciting, for the first time in many weeks ScraggleRock is correct I mean right! I would stick with synthetic and the 10W/30 Mobil1 since that's what you've been using! Check that dipstick frequently and keep it to the full line. I was using AMSOIL 10W/30 and started using oil between changes, switched back to Mobil1 and it quit.
Gary

 

^do u also agree with using 20w50?

 

You could run 10W40 where you live, but I wouldn't recommend 20W50. 10W40 is the highest viscosity recommended in the owners manual for our chart if you live in a warm climate where temps never get anywhere close to 0 degrees Fahrenheit. If it takes 20W50 to control the oil situation in the car, sad to say it, but it's time to either get a new motor or rebuild the one you have.

 

i wonder wat kind of gas is used with the higher weight

 

?? The kind of gas doesn't matter. It'll burn slightly more gas with the thicker oil but the octane or brand won't matter.

 

yea i meant used up as in wasted from doing that.

 

I would do 10w40 and switch to conventional. At that rate you never have to change your oil, just filter every 5k or so.

 

I experienced maybe a half of a mile per gallon loss. Unnoticeable.

 

Gas millage wise, our engines do not benefit much at all from low friction oil choices other than helping clean a bit better. we have other friction loss issues that greatly outweigh oil considerations.

 

back on topic, its wordy a hell but Bobistheoilguy.com has enough oil and chemistry data to drown you.. good read.

But bottom line TLR, look ta the temperature chart in the owners manual, use the oil in the chart.