Since we hijacked another thread lets start/finish our oil grade discussion here.
The question is do you use a multi grade oil (15-40 ish) like 99% of the population or a single grade for warm outside temps and why.
I like multi grades for cold starts but single grades for summer temps and IMO single grades maintain their advertised properties significantly longer, multi grades contribute to sludge build up and break down faster than single grades. Of course I do not want a single grade 40 for -10C.
Also in many parts of our great continent you can get temp changes from -5 to +30, in one day (e.g. Alice Springs in winter), and I might add, it is what the manual recommends.See where your coming from Paul, but Perth is not the tropics, neither is where I am near Brisbane Queensland. Even though our summer temps can be in mid thirty's to 40+, winter temps can go down to -5.
Traveling this great land of ours bring a further need for multi-grade, last year while traveling from the "Kimberlies" to "The Red Center", temps went from 40+ to -4 over the duration of a couple of weeks (late Autumn, your Fall).
Ideally we could change a mono-grade to suit the seasons, but in reality it is far easier to use multi-grade, which it is also designed for.
Adding to that, with modern multi-grades and our 5000km oil changes (TD4.2's) the polymers have not broken down.
On the same day?
Also in many parts of our great continent you can get temp changes from -5 to +30, in one day (e.g. Alice Springs in winter)
