Curious to see what the FI guys are running for oil. My DE eats a lot of oil at 5w 30 and I think im going to do 10 40 any thoughts on the thicker oils? Im burning oil bad. (NO LEAKS) 2006 model 350z

 

10w40 is just fine in your car. But dont think that will cure your oil burn.

 

Appreciate it! Any clue how to start diagnosing the burn? It seems a lot and I know these engines are notorious for this. I'm burning 1 qrt roughly every 300 miles. James,

 

I personally ran Rotella T6 and religiosity changed my oil every 2,500 miles. I would stay away from Royal Purple. Amsoil sells top quality fluids but r a tad expensive. Long as you do consistent intervals of 3k miles at least per oil change while monitoring oil levels regularly you will be fine for regular driving and occasional hooning

If I'm not mistaken, burning oil means your piston rings are worn and allowing oil to be mixed within the combustion chamber. I would do a compression test.

 

Thanks for the response! Why stay away from royal purple is it a bad oil? Or just cheap? Good idea about the compression test. Thanks!
James,

 

Royal purple hasn't had great results from testing results with the VQ. BTW, if you really want to learn about used oil analysis and VQ engines, treat yourself to this sticky:

https://my350z.com/forum/engine-and-...-and-info.html

 

Thanks for the info! Im starting to think it may be warn pistons from the supercharger. I'm pushing 410 to the wheels with a stock block.
James,