I've been running Delvac 1300 15W-40 recently, but had a lot of cold start problems this winter and I was thinking that might have contributed. At about 4,500 miles what I think is an intermittent lifter tick started, but only rarely.

I figured I would switch to Rotella T6 5W-40 and see how it goes. Now the lifter tick is pretty persistent and is about 50% of the time when I have the engine at idle. It tends to cut out once I've had the rpms up for a couple seconds.

Has anyone else had lifter tick start when switching to synthetic or a lower oil wt?

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1992 MB 300D 128k
1988 Volvo 244 200k-ish