I used to be bad about using the same oil forever.
Now I tend to use whatever is cheapest.
2018 F150 3.5 Ecoboost
OCI #1 - Pennzoil Gold Dexos (found at local Wholesale place like a Big Lot's).
OCI #2 - Mobil 1 (On sale at Walmart + Rebate).
OCI #3 - Motorcraft Blend WSS-M2C961-A1 (Free at Dealer)
I guess it doesn't matter as long as it meets spec. Truth is they change formula about every other oil change anyway
Now I tend to use whatever is cheapest.
2018 F150 3.5 Ecoboost
OCI #1 - Pennzoil Gold Dexos (found at local Wholesale place like a Big Lot's).
OCI #2 - Mobil 1 (On sale at Walmart + Rebate).
OCI #3 - Motorcraft Blend WSS-M2C961-A1 (Free at Dealer)
I guess it doesn't matter as long as it meets spec. Truth is they change formula about every other oil change anyway