Castrol Edge 10W40 vs Edge 0W40

[aquariuscsm]

Oil change on my car is coming up. Walmart no longer carries the Edge 10W40. I picked up three 5 quart jugs of Edge 0W40 for $5 a jug,plus 4 oil changes' worth of GTX Synblend 10W40. How different is the Edge 0W40 vs the Edge 10W40? Are they basically the same with the 0W being a lighter 40 weight? Is one a higher quality oil over the other?

FSM specs 10W30-20W50,and these cars also came with a sticker under the hood saying to use 10W30 up to 60F and 10W40 60F and warmer.

Nissan TSB even says to use 5W30 for all Nissan vehicles *except 300ZX*. So in my application,what's the outcome of the 10W40 vs the 0W40?

 

[Quattro Pete]

Originally Posted By: aquariuscsm
Are they basically the same with the 0W being a lighter 40 weight?
They're both similar at operating temp. But the 0w-40 doesn't thicken as much at colder starting temps.

Quote:
Is one a higher quality oil over the other?

Hard to tell, but based on the MFG specs that they meet, I'd say the 0w-40 is higher quality.

 

[OneEyeJack]

The cheapest one is the best quality.

 

[HTSS_TR]

Castrol Edge 0W40 is too thin for your 300ZX in South Texas even in winter months.

The best solution for you is ship those water thin 0W40 to me and I promise that I will dispose it properly !

 

[Dallas69]

Just mix em

 

[artificialist]

0w40 will be fine. The Nissan VR38DETT experiences even more stress than a VG-series engine, and the current GT-R calls for 0w40.