STP GST60300EN12 Oil Treatment for Petrol Engines 300 ml

Really impressed. would recommend .

I use this in a Ford Capri 2.0 to add a bit of extra zddp to the oil to protect the camshaft. Plus the engine has done 100k miles, so the extra viscosity keeps the oil pressure healthy. It may just be my imagination, but I'm sure the car runs quieter and cooler with this in. I add it to the 10w/40 semi-synthetic oil Ford originally recommended for Pinto engines, and it seems to alter the viscosity to approximately that of a 15w/50 or 20w/50, judging by the oil pressure gauge (and how it flows when I drain it). All in all brilliant for a classic engine, but probably not a good idea to put it in a post-millennial vehicle.

Rather smaller than what I expected

Having bought my granddaughter a 10yo jalopy for her 18th birthday, I decided a tad of engine care wouldn't go amiss!I have used STP additives since I was a poor student myself (many moons ago) and have never regretted it. Prevention is always better than cure!This time the car seems to be happier and running smoothly. Let's hope it stays that way!Remember to closely follow the instructions on the container.

Added to 10-40 oil + renewed oil filter haven't been out on bike since I done oil change so can't comment. My friend is a mechanic and he highly recommends all stp products.

I like to use this on diesel engines, as I believe it cleans the engine better than on petrol.

Do not add it to new oil without warming your car as per instructions

I never really know how well all these car products such as oil addictives or fuel additives actually work or benefit my car, but at such a cheap price they're worth ago.Personally half an hour after adding this oil additive to my engine, I felt that the car drove more quietly and possibly a little more smoothly.I'll definitely be using it again in a few months.