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Two engine questions: New oil standard and one on fuel consumption

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Tjensen   
Wed Sep 12 2018, 08:10am
Joined: Jul 17 2012
Member No: #954
Location: Bergen
Last service was yesterday and they filled "Castrol gtx pro 0w-30 C2" Is it OK to replace the usual 5-30 with 0-30 ? (both are C2). I can take up my old practice and bringning my own oil (Mobil 1 5-30)

The fuel consumption on my standard trip over Norwegian mountains has usually been very low: 0.57-0.64. But now it has risen to 0.72 (still probably OK, but...). Where should I start to look for problems ?
Tjensen   
Fri Sep 21 2018, 03:14pm
Joined: Jul 17 2012
Member No: #954
Location: Bergen
UPDATE: My garage sold me a bottle of special PSA injector cleaner, (PRO Cleaner and booster for diesel) they had good experiences with that, especially on fuel consumption. Also changed engine air filter. After 500 km the average consumption had fallen from 0.74 to 0,64 (same trip)
 

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