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You can and it will be fine ....unless you get some water intrusion from a leaky shaft seal caused by running over some fishing line. Ask me how I know. The marine lower unit 75W90 will include some emulsifier additives I believe.

Been doing exactly as the OP says for about 30,000 miles on my 2016 F150 with a 5.0. I use an XG10575 every other oil change and 5 or 10W30 conventional at 5000 mi. intervals. Never needs any make up oil. Lot of highway miles towing fairly light boats.

Have been running Fram XG 6607 on both a 2019 Fury and a 2023 Goldwing. Also XG 7317 on Mercury outboards

Been running Rotella 15/40 conv. for 9 years in my Kaw 691/Hustler SD54 down here on the gulf coast. Same oil in my V Twin 999 home generators(8 years), the same oil in Mercury 4S outboards(12 years)

Been running Rotella 15/40 and Delvac 15/40 for many years in a 50 Merc. and for the last 4 years a 60 Merc. Average about 45 hrs. a year fishing and crabbing. Never a problem, always available. Water temp a lot of time like now close to 90.

Been using Fram Ultra 4967 on my Kaw 691 since I got it in 2014. Also use it on Generac 999 V twin/20KW in my whole house generator.

2019 Mercury 60 FS. Rotella T4 15/40 and Fram XG7317 once a year, 40/50 hours average per year. Tracker 17/54

Found a 2019 Honda Fury last week, a guy had bought new and parked in his garage since then. Bike had 47 miles. He had been starting it occasionally and it ran fine. I bought it, aired the tires, checked other fluids, filled it with Shell Premium 93 and drove it 50 miles home. Checked again...

SR5, I agree with you , but there are some CAFE coolaid consumers around who still think engines can't operate without 0W20.

Almost 70 here yesterday. Made almost a hundred miles to a friends place and back before the bad weather moved in last night.

Had a 1026 Ford Fusion with the 1.5 Turbo for 4.5 years. Loved the car overall, but right away I noticed how black the oil was at 3000mi. I run my truck(F150-5.0) 5000mi, but never past 4000 on the Fusion. It never used any oil though. Yeah, I know you can't tell about the oil from...

Yeah, last few days have been out riding , it's been in the mid 70's in the afternoon and I just got my new to me Harley Dyna Switchback. Haven't ridden in many years and trying to get used to it. So far so good, love it .

Had a 2016 Fusion with the 1.5T, ran it for 4.5 years on 87 octane as daily driver. Great mileage and power for DD. Oil would get black as tar in under 4000 mi, OCI never went above that. Never any fuel smell in the oil though. Now have a new Mustang 2.3 Ecoboost as wife's DD. Have tried 87 and...

My wife's Mustang only has a few thousand miles on it. I was very satisfied with the 1.5 Turbo in the 16 Fusion, we drove it for 4.5 years without issue. Enough so to buy the Mustang Turbo to replace it. Great mileage for road trips, about 32 MPG(calculated at fill up), at 70MPH down along the...

15 hours, Fayetteville NC to Baton Rouge La. 900+ miles

Yup, all stock.

$1.65 at Shell in south Louisiana

Originally Posted by FordCapriDriver Originally Posted by LeoStrop Originally Posted by buster Diesel oils turn low rpms and have higher levels of soot where as gas engines run higher rpms and have to deal more with acidic contamination from combustion by-products. More defoamants, AO's and acid...

Mercury Quicksilver 75/90 lower unit oil.

IMHO, mostly placebo and computer learning. It's in the way you drive, tire pressures, and seasons. Have never seen a measurable increase in MPG during and after "break-in" that could be repeated tank after tank.