STP Blue Bottle

liberty2701 · #1 (**permalink**) 10-23-2009, 07:43 PM

How much does the STP Blue bottle oil treatment increase the viscosity of your oil? Would it make a 15w50 even thicker?

pawpaw · #2 (**permalink**) 10-24-2009, 07:37 AM

How much affect it has, depends on how many qts of oil the STP is mixed with!!!!

liberty2701 · #3 (**permalink**) 10-24-2009, 09:08 AM

6 Qts of oil

pawpaw · #4 (**permalink**) 10-24-2009, 04:20 PM

My uderstanding is at that mix ratio, it would make a 5W-30 be more like a 10W-40.

So it's not the kind of additive to be mixing in a crankcase lube & expect it to do it's protection thing on cold starts.

Ed · #5 (**permalink**) 10-27-2009, 09:12 AM

How bad is your blowby / piston slap / tailpipe smoke from your old engine?

jimandmandy · #6 (**permalink**) 10-28-2009, 11:01 AM

15W-50 is a synthetic viscosity. If oil burning is the issue, why not just switch to 20W-50 dino? While it may be the same at 210F, it will be thicker at any temperature lower than that and most engines dont run at high an oil temp anyway. Ive never understood the logic in using STP, Lucas, etc, instead of just going up in viscosity of the oil itself.

Jim