Other than perhaps your auto-enhanced industry option scores (an overlay of the base score), you can generally sort the FICO element of installment loan scoring with a simple, and cheap, installment loan and then pre-paying a non-trivial amount. The payment just affects your DTI calculation but not FICO, FICO is just open, current balance / original balance under the more modern algorithms.
Basically you take the loan and pay it right back down to less than 8.9% technically, though there's no reason one can't pay it down to 5% or 1% even directly... and then you just sit on it, for years potentially and it benefits your FICO score the entire time it's open. One of the tricks for gaming the algorithm frankly but it works if you don't have any other open installment loans.
Not all lenders are good for this, DCU for example while a darned good CU fails miserably on this one with their payment policies; I think Penfed works but not sure anyone's really tried it. Look at the Quest for an SSL thread I think in Personal Finance for ideas, actually I should probably go take one for the team now that I have a new auto loan and test a few myself.
Also, for my own edification, would you mind posting the tradeline details for that lease?
Namely, original balance and current balance and term? Would be appreciated 
@revelate
Sorry, I somehow missed your response... Sure, I have no problem giving the details of our lease.
2018 Mercedes GLC300 AMG.. MSRP of $61, 067... Negotiated for a Gross Capital Cost of $54,863 plus tax, license, and negotiated the pre-paid maintenance down to $1400. $1579 down payment which included 1st mo payment of $679.12 plus Monthly tax of $56.88. Total monthly payment of $736.00 for 48 months with a mileage allowance of 12,000 per year. Residual at end of lease will be $26,144.10.
Lease is thru Mercedes Financial. Husbands FICO 8 of 810 at time of contract got us Tier 1 rates with Mercedes. My FICO still needs some work. 
. That's why I was asking about being added to lease, to gain the benefit of an installment loan. I have two that have been paid off and closed over 5 years ago.
I love love LOVE this car. It's black on black and pretty zippy with a turbo engine. I would highly recommend this car if anyone were looking for a crossover type car. I had an x5 before this. Paid more for that, and it doesn't even compare to the mercedes.
Hope those numbers help your searching!
@Sadie5150 wrote:I have only 1 baddie left on my CR. Husband and myself went to buy a new car a couple of months ago, and ended up leasing one thru Mercedes Financial. We both signed all paperwork and payment is $736 mo. When it comes to reporting to CRA's, Mercedes is only reporting on my husbands CRA. Question is.... would it help me to have this on my CR, as I have no other installment loans? Sold my home (in 2012) when we got married and moved into his house. Or, should I just keep quiet and not say anything because the payment is a substantial amount?
The baddie is a collection that won't fall off of report until 12/2019.
My advice would be to just let it be. It's very difficult to calculate the effect of installment loans & car leases on FICO scores, and it has wildly different effects on different scoring models. Also strange things happen when the unpaid balance is high, and when the balance is paid off.
IMHO, forget about it. You don't need it to have good scores.
@Anonymous wrote:In terms of FICO scoring, it's not really an "installment" section, but rather "credit mix" and "amounts owed" that you'd be helping. Credit mix by adding an installment loan to your report, amounts owed because that account would be at 8.9% or less of the original balance... as opposed to the car lease that would be at 90%+ if you were to add that today.
My mortgage scores, which I consider the most important scores, are never affected much by these installment loan changes.