Quote:
Originally Posted by Robbo1
How important is it to Use 5W-40 ?
I'm now running 10W-40
I live in Perth, so never gets very cold, so would 10W still be OK ?
I guess it's more about how fast the oil circulates around the engine on startup, so does our engine need the 5W ? Or will 10W still whizz through the oil pump and wet everything fast enough ?
How long have you lot been using 10W oil for ?
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Personally I have been using the Penrite Enviro + 10w 40 Diesel Engine Oil over the past 3 years in both my VM's. Never been a problem.
While in Perth a couple of weeks ago morning temps were single digits, but then even Brisbane gets those chilly mornings.,,,but never -20.
The difference between the Penrite 5w 40, which isn't CJ / K compliant, and the 10w 40 which is, isn't all that much according to Penrite. I wrote to them a while back querying whether their 10w would be ok in lieu of 5w.
They responded and wrote that the cold flow difference between 5w and 10w is 5 degrees. 5W will flow to -30, where as the 10w will flow to -25 degrees...so no big deal in Oz.
They said that as far as cold starts go in our climate...no issue, the cold oil of both grades will flow quickly through the engine.
I can understand why FCA recommended 5w 30 originally, not just to bolster their fuel economy figures, but the recommendation is International, whether you live in the UK or Africa. They wouldn't be giving more than one recommendation for differing climates. The back flip to 5w 40 we know about and was likely due t0 the 30 not being thick enough in high heat high pressure situations allowing bearing / journal contact.
Being I do a fair bit of towing I am very happy with the Penrite Enviro + 10w 40 and will likely be sticking with it unless / until I find something better....