It seems 15w-40 is the standard diesel weight. I bought Castrol last time because it was on a good promo sale.... 5 quarts and filter for $5 (after rebate).
I recently swapped to German Castrol 0w30, it starts high 30 and stays high 30, so far, I've experienced no oil loss - but it's too early to say, but it makes sense.
I have been using it for about 15k km and two oil changes and have noticed allot less burn off compared to the dealer filled castrol 5w -40.
for the ow-30 im guessing your talking about german castrol. thats what im using right now and it works well
IMO most anything is better than Castrol!
I have been using Castrol 0W30 European Formula all year round and it offers great protection in the coldest cold and the Highest Humid Heat. I used to use Mobil One 0W40 but it seems my car likes the Castrol 0W30 better since it runs smoother and gets a tad better gas mileage.
I have been running redline 5W40 since 5k miles in my 08 GTI and I noticed an immediate improvement in turbo spool up. Others have noticed this improvement on other turbo cars as well.
i use castrol 5w30 syntec edge. advanced full synthetic.
I use castrol syntech 10w40.
Anyway, my W8 has been fed only Castrol LL 2 & 3 (SLX, Professional Powerflow) & Shell Ultra Helix VX (Longlife 3 oil made for VW) . I don't know if that's the magic that has made my cam tensioners last this far, but I'm going to heed that mechanics advice in the future too.
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