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"In addition to the earlier post, at what intervals do I have to change the ATF after switching to synthetic. The manufacturer recommendation is at 80,000km for normal ATF."
--That is too funny. Over here, the federal government forces car makers to hold to a certain dollar amount of "expected cost of ownership", which is basically maintenance items. They are levied if their car line generates too much waste oil and parts by requiring more frequent service than another manufacturer. So expensive makes like Volvo will do stupid things. Buy a Volvo in the States and they tell you that the recommended oil changes are 15,000 miles, (25,000km) with standard oil. Spark plugs are good for 100,000 miles (160,000km). They also state that the ATF and coolant are "permanent, lifetime" and NEVER need changing!!
Having said that, just do my dump and fill method. Knock 3 liters out of the pan at every oil change. Replace it with 3 liters of fresh synthetic. It will take care of itself. It also allows the "reset adaptivity" function to get used to the new fluid characteristics.
Secondly, currently I am using the SAE 20-50W (i think). This is due to the hot and humid wheather at this part of the world. The average temp. here is 36 degree celcius. Wouldn't 5-30W cause overheating of the engine?
--Another myth. That B234 head is a delicate machanism. The passageways and capillaries rival that of a 960. What you need sir is something that flows like hell! 20w-50 will kill that new head you just put on. Maybe not tomorrow, but it is not healthy. The big selling point for 20-50 is that is "resists thermal and viscosity breakdown" True synthetics like Mobil and Amsoil will not burn...end of story. Thermal breakdown is not possible. Viscosity never leaves the 5-30 range, ever. That range is just perfect for that engine. 36 degrees?? Bah! We see 43+ here in the dog days of summer. I wouldn't run anything else.
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