…. so if you put in a grade of oil other than that recommended by the manufacturer and the engine developed problems shortly after, then just maybe you are not the best person to be giving advice on oil perhaps, perhaps, perhaps?
Errr...my words, copied and pasted..
I had a lovely Vectra SRI that was only really used locally and mostly short runs.
The manual suggested going down a grade, that would give better economy, better cold engine running etc...so i did.
Within a year the engine developed a horrible rattle internally, like a bearing going. Not big end, it ran for a while till i got rid, so it wasnt terminal...but i did wonder if it was down to the thinner oil.
TBF, i didnt say WHY the manual suggested going down a grade, that was because i was a low distance, mostly town driver. Taxis were also included in that recommendation funnily enough, which did surprise me.
And its that very experience that makes me the PERFECT person to offer advice. TBF, it MAY not have been the oil, but what i offer errs on the side of safety, not the other way round
I say manual, it was a Vauxhall tecnical publication...