Opinions on using 10w40...

A Q45 forum / Cima forum for the President of Infiniti's lineup. Brought to you by Infiniti Parts USA, your OEM source for Q45 parts!
98_Q45
Posts: 143
Joined: Mon Oct 16, 2017 12:12 am

Opinions on using 10w40...

Postby 98_Q45 » Tue Jun 25, 2019 9:00 am

So I’ve tried 3 grades so far: 5w30, 10w30, and now been using 10w40. I have worn oil rings or whatever and I get blue smoke after idling long, especially in hot weather. Changing the grades of oil hasn’t made a difference with this.

However, 5w30 would burn thru quickly...and leaks.
10w30 fairs a little better.
But recently I switched to 10w40 and noticed far less oil leaks (despite me already doing several oil leak fixes).

I’m just concerned about gas mileage, because I drive a lot on highway. I already don’t get the best gas mileage, but wondering if it’s even noticeable. I’m also considering 0w40 for quick flow at startup, but heavy enough to not leak at highway temps.


3Q Jay
Posts: 2164
Joined: Sat May 08, 2004 6:23 pm
Car: 94Q45a, 95Q45a (mine)
97Q45t (sold)
01 B15 Sentra (Daughter's)
2010 A6 Avant (also mine)
Location: Florida Coast

Re: Opinions on using 10w40...

Postby 3Q Jay » Tue Jul 02, 2019 2:26 pm

I've not heard of the VH41DE 'wearing out' in the rings and valve guides? I suppose it's possible. what specifically is leaking (much more common)?
as to oil grades, I'm a huge fan of full synth 0w oils. I ran straight M1 0w-30 AFE in the VH41.
I run 5qt 0w-30 AFE and 1qt 0w-40 in the VH45DEs. Have stuck with this blend now for many many years, and I have phenomenal UOAs to back it up.

J30tChumpCar
Posts: 466
Joined: Sat Jan 23, 2010 1:34 pm
Car: 1995 J30t Totaled @ Charlotte motor speedway
1994 J30 gutted caged road racer Now with VH45DE!
1966 Chevy Corvair V8 mid-ship conversion
Location: WPB Fl.
Contact:

Re: Opinions on using 10w40...

Postby J30tChumpCar » Tue Aug 20, 2019 4:36 am

Smoke at a traffic light indicates worn valve seals,not harmful but based on price most people ignore.

No oil recommendations.


Return to “Q45 Forum / Cima Forum”