what's the difference between ATF and regular engine oil? The one in my transmission looks and spills like oil but is read. its reallly ok to swap a quart of regular oil for a quart of this to help a cold start tapping lifter? is there ever a time when you should NOT add atf?

Thanks,
CDT

__________________
2002suzukiGSF600S
1985 190e 2.3

here's a few links to help answer some of your questions.

Product Data sheet on Mobil 1 ATF: http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil1SyntheticATF.asp

Product Data sheet for Mobil 1 0W-40: http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil1_0W-40.asp