03-03-2019, 07:41 PM
A thing to keep in mind about multigrade oils is they do tend to break down slightly with prolonged use, in other words an oil which starts off as a 20W/50 may end up performing more like a straight 40 grade (in warm condition), which is about as thick as you'd want to be.
You're absolutely right to worry about thick oil struggling to get through jets and that's where the 10W is a distinct benefit - 90% of engine wear occurs at cold start.
I can't say I've ever worried that much about oil change intervals, I view it more as a constant loss system!
The strainer in the sump by the way is rudimentary at best. You may well find on inspection that the oil is able to simply flow around it! A full flow filter is a definite improvement.
You're absolutely right to worry about thick oil struggling to get through jets and that's where the 10W is a distinct benefit - 90% of engine wear occurs at cold start.
I can't say I've ever worried that much about oil change intervals, I view it more as a constant loss system!
The strainer in the sump by the way is rudimentary at best. You may well find on inspection that the oil is able to simply flow around it! A full flow filter is a definite improvement.