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lovesmyvoyager - use that 15 / 40 to give your engine a good flush out of all that black cack. And put some flush additive in the old crap oil before you drop it out - plenty hot - and you will see / feel a genuine difference. Yes it will take you a bit longer on the drive, but worth it. My time consuming technique for my vehicles (not every time guys no) 1 - drive the car get it hot, come home put the additive in, idle on the drive for recommended time until fans come in / go off (if they do on your diesels) 2 - drop old crap out. If you can bring yourself to do it swap an extra filter too. 3 - fill engine with your 15 / 40 (or in my case when I'm feeling OCD the flushing oil) 4 - run till hot again, or say 20 mins, with occasional fast idle 5 - drop that cack out and be surprised how black it still is 6 - change filter 7 - put in your lovely new 5W-30 and be surprsed how clean it is, for a bit anyway! So to sum up, in Britain, for diesels, without any silly extreme cold winter days, either 5W-30 or 10W-40 is fine. And basically for petrol the same ultimately, but with preference to 5W-30, semi synthetic. And don't stretch oil change intervals, especially if you do towing, lots of idling, short journeys, my book says 10,000km (6250 miles) in that instance, or twice that if considered "normal" driving routine. Petrols are down to 3000 miles for town work etc!!!!! Or 7500 miles for normal use. Or you choose obviously, it's your engine.

26" and 16" rear