johnmac185
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hi, any techies out there know if i can safely use thicker oil, i use 10w/40 at moment, i am thinking of using 10w/50 or 15w/50 semi, its old van 2004 model Citroen Relay 2.2hdi with nearly 150,000 mls, old friend who was an engineer tells me he always used thicker as vehicle got older with a lot of miles, mine is going well and don't use a lot of oil between changes, anyone any thoughts on this, will it put strain on any parts like seals or the like,,,John