I recently inherited an '84 Cadillac Biarritz convertible and was wondering what oil you would recommend for the HT-4100 engine, which I am told has "flat tappet" lifters and requires an oil with a decent dose of zddp. I was told that the car was run on 10w-30 conventional with an STP zddp additive to protect the cam because there is not enough in the "modern" oil formulations. Apparently this motor is notorious for being problematic, so I am keeping my fingers crossed with it.
I am not wild about running an additive like that if I don't have to and was hoping there might be some good options that won't require the additive. I was thinking a diesel engine oil might be more inline, something like a Rotella T4 10w30. I also have 5qts of Formula Shell 5w30 I picked up on clearance if there is any chance that might be a reasonable option.
The car has about 55k miles on it and will likely be driven about 1 or 2k miles a year. It is a cruiser, not a race car (with only 135 laughable hp), though it does have to rev that under powered engine sometimes to pull hills in my area without holding up traffic.
I am not committed to conventional either, if a synthetic or blend might be a better option, that is what I will likely go with. We intend to keep the car in the family for quite some time, as my FIL wanted my daughter to have the car, and she is still at least 10yrs from driving age.
Any input appreciated. Thanks!!
I am not wild about running an additive like that if I don't have to and was hoping there might be some good options that won't require the additive. I was thinking a diesel engine oil might be more inline, something like a Rotella T4 10w30. I also have 5qts of Formula Shell 5w30 I picked up on clearance if there is any chance that might be a reasonable option.
The car has about 55k miles on it and will likely be driven about 1 or 2k miles a year. It is a cruiser, not a race car (with only 135 laughable hp), though it does have to rev that under powered engine sometimes to pull hills in my area without holding up traffic.
I am not committed to conventional either, if a synthetic or blend might be a better option, that is what I will likely go with. We intend to keep the car in the family for quite some time, as my FIL wanted my daughter to have the car, and she is still at least 10yrs from driving age.
Any input appreciated. Thanks!!