Engine oil in a 302

I received my 73 Maverick around 10 days ago. Together with the car I found in the seat some invoices.
I checked them and found out that on the last service engine oil was changed. I'm a bit surprised to see that the oil is some 10W30 synthetic. The engine looks stock and not rebuilt, and as far as I know in those engines we use mineral oil with 15w40, 20w40,20w50, depends the season or where you live.
Also, is Motorcraft FL1A is ok for my engine? ( now Firestone TF8A).

 

Fl-1A is fine...

Why do you want to put that 20W-50 goop in it??? Depending on temp ranges, back in the day Ford recommended from 5W-30 to 20W-40(Synthetic was yet to be marketed)... Assuming temps are generally above freezing, these days I use 10W30, 10W-40 or maybe 15W-40... If it's tight enough that it doesn't burn or leak the 10W-30 synthetic, I'd keep using it, better oil than the dino... One of the best off the shelf oils is 0W-40 Mobil 1...

 

Agree. FL-1A is considered to be a go0d filter. 10-30 is common in North America and for France's weather, will be fine. Synthetic is a personal choice. I use it in my tow vehicle year round and use it in all my vehicles in the cold Canadian winters.

MD

 

I read a few times that synthetic oil is not very good for old seals we have in our engines (not rebuilt ones).
SO ok I will continue this way with 10W30 synthetic.
Thanks.

 

I'd be using some zink additive. Regardless of oil. Unless you use racing oil with it in it.

 

I dunno about oils in France but there is still as much zinc in today's oils as there was in early/mid 1960s... That ran somewhere around 700 ppm, I believe today's limit for 0W-20 thru 5W-30 is 750 ppm, which is enough for a mild cam with stock springs(other grades can be higher)... Levels increased to around 1200 ppm as wiped cams became a issue in HI-Po engines...

Here's what Mobil 1 has(one of few that has easy to find specs).

https://mobiloil.com/~/media/amer/us/pvl/files/pdfs/mobil-1-oil-product-specs-guide.pdf

 

So Mobil 1 oil has zinc inside already, I would continue with this 10W30 Mobil 1.
Many thanks.

 

Is Lucas oil is famous in US?

http://lucasoil-motor.com/fr/huile-...haute-performance-5-litres-0049807101282.html

 

Lucas is marketed as a high-end oil but I've never seen anything to prove it's better than Mobil 1.

MD

 

10w-30 is the correct oil. If you live in a very cold cl8mate, 5w-30 will work. I use FL1-A filters.

 

At last service in US, they fill up with 10W30 oil. I can't find this grade here so I will go with synthetic 10W40 from Mobil. I would like to know the % of zinc inside.
Is that a good compromise?

https://www.mobil.com/English-GB/Passenger-Vehicle-Lube/pds/GLXXMobil-Super-2000-X1-10W40

 

Try google "zinc content in Mobil 1 oil". However, why not try the Castrol line of products. I often use Castrol oil in Canada. What are the predominant oil brands in France?

MD

 

You don't need a zinc additive on an old stock engine. It's been running just fine all this time without it.

 

Thanks guys.
Here we find Total, Castrol, Shell, Motul, Elf...

 

According to your info the Mobil Super 2000 is a semi-synthetic oil. Mobil 1 is a full-synthetic oil and is better but more expensive. The Mobil 2000 would work fine. If you want to spend more money use Mobil 1. Just my opinion.

MD