The 300D/300TD engines generally have the air cleaner located near the engine center over the turbo.....the one I saw recently
(85) has a smaller diameter, and is mounted forward and closer to the radiator...the turbo is clearly visible. What year did they make this change?

Thanks,

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D

Probably a California model.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k

I think they all changed in 1985, but it might just be the California models. I know they were put on all models with trap oxidizers.