well i today thought that id give her some more attention and do an oil flush using the wynns stuff so i did a little experement, i bought some cheap halfords oil and droped all the old oil out and put in the new halfords stuff followed by the engine flush just so i could see how much crud came out with the fresh oil anyway i put a dab of fresh oil on a white piece of paper and when i dropped the treated oil i put a dab of that next to it heres a pic of it,

 

 

quite impressive really bearing in mind this oil was only in the car for the specified 15mins at 2000rpm and it was fresh

Yeah the difference is quite mental really. I've been known to do exactly the same thing before and I think I've talked about it on here. Especially with older cars it tends to prove worth it. Without the flush, the cheap oil you put in would probably have stayed golden for a while tbh, because the flush catches all the crap in the engine and puts it into the oil. You could probably do this another 2 or 3 times and get similar results before the treated oil ever comes out golden, makes you wonder just how much crap is in there don't it?

Would some of that not have come from the undrained oil in the oil cooler?

Would some of that not have come from the undrained oil in the oil cooler?

 

Some of it, but not enough to turn it that black. When you do the flush and put the new oil in, I usually drive it for say 100 or so miles, then do it again and it comes out blacker than black again. You can of course drain the oil cooler as well, but most don't bother.

When you do the 100 miles after the change do you just use some cheap oil as you're chucking it almost straight away?

Depends. In the GTR I used to always buy the same oil, Mobile 1 Motorsport 15w 50, was expensive as FOOK, but I got a bit of a discount buying bulk, so would buy like 4 years worth, then use that to do every oil change. Bearing in mind I did an oil change every 6 months on the GTR and did 2 flushes every oil change 100 miles apart, imagine how much oil I used over 2.5 - 3 years, lol.

 

In the Z, I'm not as flush (Pun intended) as I once was, nor as anal believe it or not, so I tend to use the cheapo Halfrauds oil. That said, on the last change I only did one flush, but it was only 4 or 5 months after the previous flush, so I figure it's clean enough, lol.

Yeah I was thinking that would get bloody expensive if you were using primo oil each time. Did you buy an oil drum's worth of oil?

Nah there's a supplier in Doncaster who supply the motorsport stuff in bulk to retailers and they agreed as I had my own company, they'd sell it to me wholesale, even though they knew I wasn't reselling it. So had something like 30 5litre bottles of it, lol.