If the manual calls for 10W30, and you’re saying your advice is better, can you point us at evidence?
Most here are open to changing their minds, but the data needs to be real, and not just anecdotal or opinion.
1 Like
Make up your mind!
2 Likes
Did you not read the part where I said summer and winter after you chopped the quote off or are you just trying to throw mud in to the whole discussion?
He needs t have one before he can do that/
3 Likes
Is what I have a problem with.
There are lots of people out there who have used this half century old engine. People who have experience with it say give it thick enough oil. Frequent oil changes apparently help too (in general not specifically for the Ford 300). Somebody drove by in a Ford truck (10th gen) with the next generation engine that replaced that one to pick up scrap and he said he changes his oil and automatic transmission fluid every 3000 miles. He has 400,000 miles on his truck and everything works fine. I don’t remember if he used 10W30 or 10W40 oil though. Just talk to real people and hear their stories before you believe just what’s in the owner’s manual.
You can put water in it. You can put 0W16 in it and it’ll still last a while. Ok fine the 90s engines recommend, not required, for what’s this the 3rd time, SAE 30 summer SAE 5w20 winter. No you’re not required to. You can put carrot juice in it. Do you want it to last 1000 hours or 1500 hours or 1 hour? It’s up to you. I don’t care what you do.
How did this become from a question of what oil to use to use in a 95 F-150, to what oil to use in your in air cooled engine?
It’s madness!
Tester
5 Likes
No more lawnmower comments, please.
Because everything has to be an argument. I said the 80s and 90s Briggs said use SAE 30 summer 5W20 winter. Then they twist my words and say you said use SAE 30 all the time but this manual from a late model Briggs says use SAE 30 or 10W30 too oh look you’re wrong wrong wrong wrong wrong! Even their late model manual says 10W30 in the summer will result in high oil consumption but they ignore that part.
It became a discussion about air cooled engines because an overheated water cooled engine is more like an air cooled engine. Why buy 10W30 instead of SAE 30 in a hot climate when 10W will be less forgiving to overheating or a missed oil change? That’s all I’m saying.
Please show us any reliable web site that recommends a single weight oil for any modern car.
3 Likes
What a crazy claim. That has nothing to do with the oil I should use driving around Texas in the summer.
3 Likes
I doubt you’ll consider this reliable but this guy has gone 500,000 miles on SAE 30 and SAE 40 oil. He was even called “stupid and uninformed”. HAHAHA. Most people are unable to do something differently than what the norm is. https://bobistheoilguy.com/forums/threads/using-single-weight-oil-in-a-passenger-car.79451/
I believe his mistake was waiting until the engine was showing signs of wear before switching to SAE 40.
You’re right, one guy’s claims do not qualify as ‘reliable’.
2 Likes
I smoke non-filtered cigarettes because they are healthier. I make this statement fully aware that no one will find my opinion reliable.
I don’t remember the last time I saw straight 40 weight oil.
2 Likes
Surely you jest. The design life of the rest of the car is probably around 200,000 miles anyways. How many people here expect a vehicle to last for 300,000 miles? I sure don’t.
Wow, look at that! @bcohen2010 is as cheap as the day is long (tongue in cheek, I don’t mean to offend), and even he thinks @TheWonderful90s is being unreasonable! 
4 Likes
The ford 4.9L inline 6 has a reputation for lasting a long time. 300,000 miles is typical. The rest of the truck usually has issues long before that.
I suspect the question is because this engine has flat tappets. As the API classifications advanced, the amount of zinc and phosphorus was reduced in the interest of pollution reduction.
I would use 15W40 diesel engine oil for this engine, this oil has a higher amount of zinc and phosphorus to protect the lifters.
Why do so many people argue about viscosity? I use whatever is left over in my engines; 0W16, 5W20, 10W30.
1 Like