Originally Posted By: Primus
Think it would be wise to keep away from all ACEA C3 oils like Dexos2 if you don't expect to sell your car after 3 years, but need more than 10K km OCI. Theoretically an authorized dealer's service should not object against using ACEA A3/B3 oil with OPEL GM LL-B-025 approval. If you a fan of Motul, suggest them to pour 8100 X-cess.
Primus , he should strictly follow the manual . He absolutely needs a low or mid SAPS oil ( ACEA C3) . Read what Lubrizol found out in pages 19-20 when a non specified older generation lubricant is used in new direct injection , gas or diesel engines:
http://www.lubrizol.com/engineoiladditives/acea/conferencepapers/lowersaps.pdf
Maintaining engine performance
• Example 1 : Euro 4 direct injection gasoline engines
– Field test comparison of a Euro 4 lower SAPS engine oil with an
OEM-approved Euro 3 engine oil
– Results shows significantly increased levels of inlet and exhaust
valve deposits with the Euro 3 oil compared to the Euro 4 oil
• Inlet valve deposits increased by 42%
• Exhaust valve deposits increased by 167%
– This resulted in
• Loss of power
• Poor drivability
• Increased exhaust emissions
Example 2 : Euro 4 direct injection diesel engines
– Field test comparison of a Euro 4 lower SAPS engine oil with an
OEM approved Euro 3 engine oil
– Results show that the Euro 3 oil gave
• Increased piston deposit formation
• Increased particulate emissions
• Increased EGR pipe blockage
over 42% blocked by soot
– This resulted in
• Loss of combustion efficiency
• Increased exhaust emissions
Testing of the Euro 3 oil resulted in the EGR pipe being
over 42% blocked with soot, restricting air flow and
leading to a loss in combustion efficiency.