The Ford Barn

wwirz · 05-23-2021, 05:10 PM

I was out on a 90+ degree day the other day. As the car warmed up the ability to shift cleanly (no grinding) became more difficult.
The following day, I got the car up on the lift to check the oil level in the transmission. The oil level was up to the mark..BUT...the oil was aerated or frothy. In my professional career I would never have suggested that aerated oil was a good thing. I drained the oil out in a coffee can and changed the oil. 1 day later, air bubbles were still entrained in the oil.
I purchased the 600W oil from one of our Model A distributors. I had some 600W that was in a closed, unopened, quart can that was in the car when I bought it. The oil in the metal can was darker, and seemed more viscous.
So now for the questions:
1. Has anyone else noticed this oil aeration? Is this normal?
2. Does shifting become a little more "grindie" as the car gets hotter? I have noticed similar in another model A I was allowed to drive.
3. Is there a real "sticky" oil that is proven to work maybe better than 600W?
All of the 600W oils I used are to the M-533 spec I noticed

Thanks for your help.

05-23-2021, 05:10 PM	#1
wwirz Senior Member Join Date: May 2020 Location: Corning NY Posts: 244	Slight Grinding when shifting - transmission oil Aerated I was out on a 90+ degree day the other day. As the car warmed up the ability to shift cleanly (no grinding) became more difficult. The following day, I got the car up on the lift to check the oil level in the transmission. The oil level was up to the mark..BUT...the oil was aerated or frothy. In my professional career I would never have suggested that aerated oil was a good thing. I drained the oil out in a coffee can and changed the oil. 1 day later, air bubbles were still entrained in the oil. I purchased the 600W oil from one of our Model A distributors. I had some 600W that was in a closed, unopened, quart can that was in the car when I bought it. The oil in the metal can was darker, and seemed more viscous. So now for the questions: 1. Has anyone else noticed this oil aeration? Is this normal? 2. Does shifting become a little more "grindie" as the car gets hotter? I have noticed similar in another model A I was allowed to drive. 3. Is there a real "sticky" oil that is proven to work maybe better than 600W? All of the 600W oils I used are to the M-533 spec I noticed Thanks for your help.