Something to think about
Blakers,
I hear what your saying, and by no means do I want to start an oil debate (believe me!!). We've all seen that mess.
BUT..... let me add my thoughts on the matter to our discussion. To see where I'm coming from. (for discussional purposes ONLY)
If most engine wear occurs at start-up, (before oil is circulated). Then a thinner oil would protect better... sooner. Couple that with the fact that most people drive relatively short distances. Supporting the reasoning behind manufacturers recommendation to use a 5w-30 in most new cars. Or at least I think that is why they recommend it.
In regards to my truck, having used a 5W-30 Diesel oil last year vs. staying with normal 15W-40 this year. I definitely see a longer delay in the time it takes to see operating oil pressure. That indicates to me that my truck is running longer without proper lubrication, hence more start-up wear.
Theoretically, 5w-40 and 15w-40 would provide equal protection at operating temp. NO??
Also, the block heater thing only works in the morning. Besides my heated garage negates the need for a block heater.
My concern lies at work. Since I typically work late, the temps generally have fallen back to their lowest point by the time I leave for home. In other words, my evening starts are like most people's morning starts. Anyway, thats why I'm thinking of using it.
Regards,