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The 6 cylinder is in the 960 only and the early models did require more frequent timing belt changes. Typically they are 40k intervals once the dampner is installed under the exhaust cam pulley. They are interference engines.
The B234F or the 16 valve as it is more commonly known is what we refer to as as "oil leaking, wallet biting, eye sore". Other than that it is a real nice motor. The Swedes only ran that motor for about 3 years in this market and other than changing the timing belt tensioner on it from manual to hydraulic there were not a lot of differences from early to late. I have worked on plenty of them and while they are not a terrible motor they do suck when compared to the B230F or FT models. They are also interference engines and they take two timing belts when you change them and the balance shaft belt is about $100.00 for the part alone. Do yourself a favor and avoid the 16V motors.
Alot of the late model 940's were turbo charged, B230FT, and are good cars. I would advise getting the latest model 940 you can and have a competent Volvo mechanic do a PRE purchase inspection on it. Turbo or non turbo, either way it is hard to go wrong on a clean late model 940.
Mark
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