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My Volvo engine oil is quite dark and dirty. I poured some Marvel Mystery Oil into the engine few weeks ago, not sure that has got anything to do with cleaning up or making the engine oil so dark or not.

I have the engine oil and oil filter ready, so I decided to go to the nearby store to get them changed.

Done the change in 20 mins, labour cost RM20 only. Poured in all 4L of oil, which was too much. The reading reach to the X letter in the MAX indicator.

Nevermind, will remember next time.

The world’s highest mileage car, driven by Mr. Irvin Gordon, used only Caltex oil in his 3 million mileage Volvo P1800. It can’t be wrong following his proven foot steps.

https://rego2oil.castrol.com/en_au/australia/#/vehicle/1_Cars_Wagons_Utilities_Car_type_4_Wheel_Drives/87_VOLVO/13065_P1800_P1800S_1963_1969

In Caltex recommendation:

https://www.castrol.com/en_ca/canada/home/technology-and-innovation/motor-brands/castrol-gtx.html

VOLVO P1800

P1800S (1963-1969)

Crankcase

Service Refill Capacity: 3.25 Litres

CASTROL GTX ULTRACLEAN 15W-40 best

Castrol GTX ULTRACLEAN synthetic engine oil technology has superior performance. Its unique Double Action formula cleans away old sludge, and protects against new sludge formation, giving you more control over today´s challenging conditions. Castrol GTX ULTRACLEAN 15W-40 is suitable for use in automotive petrol and diesel engines where the manufacturer recommends an ACEA A3/B3, API SN/CF or earlier specification 15W-40 lubricant.