Hey guys I have a 03 350z track edition, 80k miles on the clock. Last oil change I put some Castro 5w30 in as winter was coming so i didn’t use 10w40 that I normally use. As temperatures rising recently I decided to change it back to 10w40 as I have a spare bottle laying around. I did roughly 2000miles after last oil change and when I drained the oil yesterday I only got 3 quarts out of it. So basically I lost 2 quarts of oil over a 2000 miles and 3 months period so there must be something seriously wrong with my car I suppose... I checked oil sump oil filter and didn’t find any obvious leak, nor did I ever find any oil underneath my car. I do have some smoke coming out from the exhaust but nothing too bad. No coolant leaks no oil in the coolant. The car still starts and drives pretty normal I even had a uprev tune last month and was making 186 rwkw. Can anyone please point me out what’s going wrong here? Or I just burned that much oil over 2000miles of driving?
Any help would be much appreciated!

 

You'll need to do a leakdown and compression tests to determine what condition your engine is in. In the meantime, you should be checking oil level on a daily basis to insure you have enough to ensure a minimum level.